Piston construction



B L. WOODLAND.

PISTON CONSTRUCTION- APPLICATION FILED 0509 ms.

Patented Apr. 5, 1921.

:Beza Z 1 4/26? gnven ro'c BERT L. WOODLAND, or M SKEG N, MICHIGAN. I 5

rrsToN CONSTRUCTION.

Specification of Letters Patent.

Application filed December 9, 1918; Serial No. 2 65,955..

To all whom it may concern Be it known that I, BERT L. WOODLAND,

a citizen of the United States, residing at Muskegon, in the county ofMuskegon and mentioned character the construction of which is novel andis designed to prevent the oil from working up around the piston ringsand causing carbon to form on the top of the piston heads proper in anygas engine and in addition maintains an effective and tight relationbetween the rings and the walls of the cylinder at all times.

More particularly the present invention contemplates the provision of adevice of the above mentioned character wherein the piston is composedof a head and an expansible ring carrying collar removably fitted in thehead and designed to produce an outward pressure against the inner sidesor surfaces of the rings producing in effect an airtight engagementbetween the piston and the cylinder walls.

Among the other aims and objects of the present invention may be recitedthe provision of a device of the above mentioned character wherein'thenumber of parts are comparatively few, the construction simple, the costof production low and the efiiciency high.

Other objects as well as the nature, characteristic features and scopeof this invention will be more readily apparent from the followingdescription t-aken in connection with the accompanying drawings andpointed out in the claim, forming a part of this specification.

The invention is clearly illustrated in the accompanying drawings, inwhich:

Figure 1 is a side elevation of the improved construction, the ringsbeing shown in section, V e

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1,

Fig. 3 is afragmentary longitudinal sec- Patented A t. 5.1921.

tional View showing the relation between the head and band or collar,and

Fi .4 is a" ers ective detail of one of the .z: P P ends ad acentthesplit 1n the band or collar.-

Similar characters of reference are employed in all of the abovedescribed views, to indicate corresponding parts. 7

Referring now, more particularly, to the accompanyingdrawings, there isprovided the improved piston constructlonwhich 1n the present instancemay be saidto consist of a cylindrical sklrt 1, the outer surface ofWlllCh is provided with an annularigroove 2, desirably positionednearthe closed outer end of the head. V

vltemovably fitted in the groove 2'is an expansible collar or band 3provided. with a split 4 and the meeting ends of the collar arecompleinentally beveled as at 5 so that the said meeting ends will liein overlapping relation when the collar is fitted in position on thehead. In order to prevent passage of oil, gases, etc., through thesplit, a lug 6 projects from one end of the collar near the inner sideedge and has the outer face 7 beveled to coiiperate with thecorrespondingly beveled face of the recess 8 in the opposite meetingedge of the collar, (while the inner edge of this recess cooperates withthe adjacent edge of the lug to insure of the provision of an eifectivejoint between the meeting edges of the collar, as is apparent. Inaddition, the collar is provided in its outer surface with a pluralityof spaced annular grooves 9 in which are removably fitted packingrings10 of the split eXpansib-le type.

In use,.when the collar 3 is fitted in the piston head and the rings 10are placed in the grooves 9 and the piston head in turn 7 arranged in a.cylinder, the collar or band .3 willcompress slightly at the split 4 andthereby exert an outward pressure against the inner sidesofthe rings 10.As a result therefore of the use of the present piston constructioncarbon is prevented from accumulating onthe top or outer end of thepiston head in'a gas engine and in addition insures of the tightengagement at all times between the piston and the walls of thecylinder. c 4

It is believed in viewof the foregoing description, that a'further'detailed description of the operation of the inventionis entirelyunnecessary. Likewise it is believed that the advantages of theinvention will be readily apparent. I

Still further embodiments of the invention than those herein especiallydefined may be resorted to as conditions or preference may dictate, asmay be in keeping'with the hereto appended claim.

Having thus fully described the invention, what is claimed as newand'desired to'be secured by Letters Patent, is:

In a piston construction a cylindrical body having an annular groove inits outer face,

a transversely split expansible collar seated in saic groove andsubstantially flush with the outer wall of said body, the side edges ofthe groove and collar adjacent to'each other being parallel with oneanother; the

ends of the collar being correspondinglyv having pressure exertedoutwardly against 7 the same by said collar. a

in testimony whereof, I afiix my si nature hereto.

BERT L. WOODLAND.

